What is considered a fever for an infant is different than that of a toddler and an adult. Program the thermometer to the age you need to get accurate color-coded readings. This allows for quick interpretation of the reading based on the age. Proven more accurate that forehead or rectal. Able to recall previous temperatures. Pre-warmed tip with ExacTemp for accurate ear positioning. Recommended for the entire family. 3-Year manufacturer limited warranty. Includes: 21 Disposable filters. 1 Protective case. 2 AA batteries.